help! pls state 1st sentence of equation.

Qn1) In a class there are 4 more boys than girls. 1/3 of the girls and 7/11 of the boys take the train to school. If half of the class take the train, how many boys and girls are there in the class?

Qn2) A motorist travels 115 km on an expressway at an average speed of 92km/h and another 45minutes on other roads. If the average speed for his whole journey is 80km/h, how far did he travel on the other roads?

Qn3) A pool can be filled with water by a large pipe within 6 hours. A smaller pipe will take 9 hours to fill the pool. How long will it take to fill the pool if the two pipes operate together?

Qn4) Find two consecutive numbers such that 4/7 of the larger exceeds 1/2 of the smaller by 5. my answer: Let the bigger no. be x. Let the smaller no. be y. 4/7x - 1/2y = 5

Re: help! pls state 1st sentence of equation.

I hope I'm not doing all your homework for you! And wouldn't it be funny if I got one wrong

Qn2)A motorist travels 115 km on an expressway at an average speed of 92km/h and another 45minutes on other roads. If the average speed for his whole journey is 80km/h, how far did he travel on the other roads?

Let me see ... 115km at 92km/h. How much time is that? 115km/92km/h = 1.25h (1h:15m)

And he spent another 45 minutes, so his whole journey was 2h.

And if his average speed over the 2h was 80, then he must have travelled 2h*80km/h = 160km

And so he must have driven 160-115=45km on the other roads. Or not.

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman